A large kitchen of 15 – 25 m² costs £9,000 – £14,000 at the budget end, £15,000 – £25,000 mid-range and £30,000 – £50,000 premium. Open-plan kitchen-diners over 25 m² with an island and premium appliances regularly reach £40,000 – £80,000 or more.
Bigger kitchens have more units, more worktop and almost always an island, and they are more likely to involve structural changes, new flooring throughout and rewiring. Here is what to budget for.
Large kitchen cost breakdown (20 m², 18 units, island)
| Item | Budget | Mid-range | Premium |
|---|---|---|---|
| Units, doors & handles | £3,000 – £4,500 | £6,000 – £9,000 | £12,000 – £25,000 |
| Worktops (8 – 9 m incl. island) | £400 – £700 | £2,500 – £4,500 | £5,000 – £9,000 |
| Appliances | £2,000 – £3,500 | £4,000 – £7,000 | £9,000 – £20,000 |
| Fitting & removal | £2,500 – £3,500 | £3,500 – £5,000 | £5,000 – £7,500 |
| Plumbing & electrics (incl. island services) | £1,500 – £2,500 | £2,500 – £4,000 | £4,000 – £7,000 |
| Flooring (20 m²) | £800 – £1,200 | £1,500 – £2,500 | £2,500 – £5,000 |
| Total | £9,000 – £14,000 | £15,000 – £25,000 | £30,000 – £50,000+ |
Indicative UK prices, 2027/28, including VAT where applicable.
The real cost of a kitchen island
An island adds £1,500 – £3,000 for budget units and worktop, £3,000 – £6,000 mid-range and £6,000 – £15,000 premium. If it has a sink or hob, add £800 – £2,000 for running water, waste and power under the floor, plus a downdraft or ceiling extractor at £600 – £2,500.
Structural work and open-plan conversions
Knocking through to create an open-plan kitchen-diner is usually quoted separately. Removing a load-bearing wall with a steel beam costs £3,000 – £7,000 including a structural engineer and building control, while a rear extension to house the new kitchen starts at £2,000 – £3,000 per m².
Where large kitchen budgets go wrong
The most common overspends we see on bigger projects:
- Under-estimating worktop metres, especially waterfall ends and breakfast bars
- Forgetting lighting: pendants, under-cabinet LEDs and downlights can add £800 – £2,500
- Flooring across the whole open-plan space rather than just the kitchen zone
- Premium appliance creep: a range cooker, wine cooler and boiling tap add £4,000+
- Bi-fold or sliding doors, often bundled into the kitchen budget at £3,000 – £8,000
Frequently asked questions
How much does a kitchen island cost?
A basic island with laminate top costs £1,500 – £3,000 installed. A mid-range quartz-topped island with storage is £3,000 – £6,000, and a premium island with sink, hob and seating can be £8,000 – £15,000.
How much does an open-plan kitchen cost?
Budget £20,000 – £35,000 for a mid-range open-plan kitchen-diner of 25 – 30 m² excluding any structural work, and add £3,000 – £7,000 if a load-bearing wall is being removed.
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